CN103959074A - System for measuring a load current and for diagnosing an absence of load or an overload - Google Patents
System for measuring a load current and for diagnosing an absence of load or an overload Download PDFInfo
- Publication number
- CN103959074A CN103959074A CN201280058687.3A CN201280058687A CN103959074A CN 103959074 A CN103959074 A CN 103959074A CN 201280058687 A CN201280058687 A CN 201280058687A CN 103959074 A CN103959074 A CN 103959074A
- Authority
- CN
- China
- Prior art keywords
- resistance
- voltage
- threshold value
- current
- control circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/08—Circuits for altering the measuring range
- G01R15/09—Autoranging circuits
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16504—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed
- G01R19/16519—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed using FET's
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
- H03K17/0822—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in field-effect transistor switches
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
- G01R1/203—Resistors used for electric measuring, e.g. decade resistors standards, resistors for comparators, series resistors, shunts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0027—Measuring means of, e.g. currents through or voltages across the switch
Abstract
The present invention relates to a system for measuring a load current and for diagnosing an absence of load or an overload, comprising an intelligent power switch (1) able to deliver a measurement (Is) of the load current on a current output, means for converting the measured load current into a voltage value (Vs) and a microcontroller (2) able to deliver orders to said intelligent power switch which are dependent on said voltage value (Vs). In accordance with the invention, the means for conversion comprise a first resistor (3) and a second resistor (4) which are connected in series between said current output and a reference potential, and the system furthermore comprises a control circuit (5, 6) able to compare the voltage tapped off across the terminals of said first resistor (3) and second resistor (4) connected in series with a predetermined threshold value (Vt) and to automatically short-circuit the first (3) or the second (4) resistor when the voltage tapped off is greater than said threshold value (Vt).
Description
Technical field
The present invention relates in general to the system for sensing lead electric current, and this system is used for idle condition or overload in diagnostic circuit.
Background technology
The non-limiting application the present invention relates to illumination in motor vehicles and/or signal and control in particular.Intelligent power switch is known for the use of the control of various illuminations and/or signaling device (main beam, dipped beam or risk indicator lamp, mistake level indicator, Brake lamp etc.) proper operation in this field.
These intelligent power switch are known as has various addresses, such as registered trademark Smart MOS, english name Smart FET or acronym IPS (its English initial that is intelligent power switch), it has load current and measures and diagnostic function, make to detect on the one hand the overload causing due to short circuit, detect on the other hand idle condition, idle condition is because fault or the supply lines disconnection of the lamp that for example used cause.
Fig. 1 has shown the traditional arrangement for intelligent power switch, and described intelligent power switch is by reference to mark 1 indication.In the various input/output points that exist in this switch, in Fig. 1, only shown for understand requisite those.Thus, BATT and GND contact are used to via current source fitting 10, switch 1 is connected to continuous voltage power supply and forms between the point of reference potential, and described continuous voltage power supply is generally Vehicular battery (not shown).OUT contact is used to set up intelligent switch 1 and by the electrical links 11 between one or more load (not shown) of its control.IS contact passes through the load current I that intelligent switch is measured
s.Finally, IN contact receives order from the microcontroller 2 outside switch 1, and the essence of described order is the function of performed diagnosis, if overload for example detected, orders the power supply that is cut to load.In operation, by being connected electrically in the use of the resistance 3 between IS contact and electricity reference, load current I
sbe converted into magnitude of voltage V
s.This magnitude of voltage V
sbe supplied to the module 20 for analog/digital conversion 20, it is preferably incorporated in microcontroller 2.2 of microcontrollers can be at any time by voltage V
scompare with predetermined threshold value, and can determine to send a command to intelligent switch 1 according to comparative result.
The illumination of current use and/or signaling device can be incandescent lamp or light emitting diode (LED), and therefore have the electric current of the very wide region that will measure by same intelligent switch.Conventionally, for 21 watts of incandescent lamps with 2 amperes of nominal currents, intelligent switch must be able to be measured electric current up to 4 amperes for detecting the object of short circuit, and the electric current that is low to moderate 50mA in the situation of idle condition.
If obtainable intelligent power switch on use Vehicles Collected from Market (major part only have a current measurement output), can not have at the output of analog/digital converter 20 enough accurate magnitude of voltage with covering gamut.
Summary of the invention
The object of the invention is, by proposing a kind of system, overcome aforementioned disadvantages, described system is for obtaining point-device measurement of load current by single intelligent switch, this is for the low current that may exist in idle condition, also for the high electric current of indicating overload.
More accurately, the present invention proposes a kind ofly for sensing lead electric current and for diagnosing the system of idle condition or overload, to comprise intelligent power switch, and it is suitable for the load current measured value on delivered current output terminal; For the load current of measurement being converted to the device of magnitude of voltage; And microcontroller, described microcontroller is suitable for according to described magnitude of voltage and command routing is arrived to intelligent power switch, it is characterized in that, described switching device comprises the first resistance and the second resistance being connected in series between described current output terminal and reference potential, and be, this system also comprises control circuit, it is suitable for the sampled voltage in the terminal place of described the first resistance being connected in series and the second resistance and predetermined threshold value to compare, and if the voltage of sampling higher than described threshold value, automatically by the first or second resistive short.
According to other viable characteristics of system of the present invention:
-control circuit is also suitable for, if sampling voltage lower than described threshold value, is automatically forbidden the first resistance or the second ohmically short circuit current.
-control circuit comprises, for example, MOS transistor, its drain electrode and source electrode are connected respectively to will be by the terminal of the resistance of short circuit, and its grid-source voltage is corresponding to described threshold value.
-control circuit can advantageously comprise overvoltage protecting device, and for example the series connection of protective resistance and Zener diode is associated, and the tandem compound that itself and the first resistance and the second resistance form is connected in parallel, and its public terminal is electrically connected to the grid of MOS transistor.
Accompanying drawing explanation
The following description of the example embodiment providing by reference to accompanying drawing, the present invention and the advantage providing thereof will be easier to understand, in accompanying drawing:
Fig. 1, as mentioned above, has described the traditional arrangement for the use of intelligent switch, and described intelligent switch is for the proper operation of diagnostic load;
Fig. 2 has shown according to the functional layout that is same as the use of identical intelligent switch in system of the present invention;
Fig. 3 has shown the variation of the load current that the voltage at the terminal place of switching device is measured according to the different operating scope of the system for Fig. 2; With
Fig. 4 has shown the possible embodiments according to system of the present invention.
Embodiment
In the remainder of this instructions, for the ease of understanding, for institute's shared element of drawings attached, be given identical Reference numeral.
The present invention is based on such discovery: although want measured range of current to can't deny very wide, but except (on the one hand) low value and (on the other hand) high value, system must accurately not measured this electric current to can diagnose respectively idle condition and overload.Based on this, find, the present invention proposes a kind of system, for the operating area being positioned at according to this system, automatically adapts to the load current measured by switch to the conversion of voltage.
Fig. 2 shown again as described above with reference to Figure 1 for diagnosing and for the traditional element of the system of sensing lead electric current.Difference in this situation is, for by the load current I measuring
sthe device that is converted to voltage is not to be formed by a resistance, but is formed by two resistance 3 and 4 between the current output terminal IS being connected in series at intelligent power switch 1 and reference potential.In addition, this system comprises control circuit, and it is by switch 5 and comparer 6 expressions, and this control circuit is suitable for the voltage V of the terminal place sampling of the tandem compound in resistance 3 and 4
swith predetermined threshold V
tcompare, and if sampling voltage exceed this threshold value V
tshi Ze is automatically by one or the other short circuit in two resistance 3 and 4.In the situation of Fig. 2, switch 5 is in parallel with resistance 4.Therefore, if the magnitude of voltage at the terminal 6a place of comparer 6 is greater than the threshold value Vt at the terminal 6b place of comparer, in this situation this resistance 4 by short circuit.If the voltage of sampling is lower than threshold value Vt, control circuit 5,6 is automatically forbidden short circuit current.
Control circuit according to the present invention makes to limit a plurality of operating areas as seen in Figure 3, and it has shown voltage V
saccording to load current I
svariation, that is:
-for electric current I
sthe lower area F of low value
mIN, to this, two resistance 3 and 4 is used for, according to following formula, the load current of measurement is converted to voltage V
s:
V
s=(R1+R2) x I
s, wherein R1 and R2 are the analog values of resistance 3 and 4
-for electric current I
sthe upper region F of high value
mAX, to this, resistance 4 by short circuit and only resistance 3 be used to, according to following expression, the load current of measurement is converted to voltage V
s:
V
S＝R1x?I
S
-unsettled zone line F
iNT, wherein, switch 5 can shake opening and closing between position, but on the proper operation of this system without any impact, because this region does not correspond to strict overload or no-load condition.
Lower area F
mINwith upper region F
mAXmake to increase the load current of measurement to the accuracy of the conversion of voltage, and therefore increase the accuracy of overload or idle condition diagnosis.
Fig. 4 has shown the possible embodiments according to system of the present invention.In this case, control circuit comprises MOS transistor 7, and its drain electrode and source electrode are connected to respectively will be by the terminal of the resistance of short circuit (in this example be resistance 4), and its grid-source voltage is corresponding to threshold value Vt.Therefore above-mentioned comparison and short-circuit function can be used single parts to be carried out very simply.Overvoltage protecting device is preferably arranged in control circuit.These protection devices for example comprise, as shown in Figure 4 middle finger, protective resistance 8 is associated with the series connection of Zener diode 9, and it is in parallel with two resistance 3 and 4 tandem compounds that form, and its public terminal is electrically connected to the grid of MOS transistor 7.
The present invention can be applicable to all load currents of wherein measuring by intelligent power switch can fall into all spectra in wide variation range, relates in particular to the control of one or more illuminations of motor vehicles or engine and/or the proper operation of signaling device.
Claims (5)
1. for sensing lead electric current and for diagnosing a system for idle condition or overload, comprise intelligent power switch (1), it is suitable for the load current measured value (I on delivered current output terminal
s); For the load current of measurement is converted to magnitude of voltage (V
s) device; And microcontroller (2), described microcontroller is suitable for according to described magnitude of voltage (V
s) and command routing is arrived to intelligent power switch, it is characterized in that, described switching device comprises the first resistance (3) and the second resistance (4) being connected in series between described current output terminal and reference potential, and is characterised in that, this system also comprises control circuit (5,6; 7), it is suitable for the voltage of the terminal place sampling of described the first resistance (3) being connected in series and the second resistance (4) and predetermined threshold value (V
t) compare, and if sampling voltage higher than described threshold value (V
t) automatically by the first resistance (3) or the second resistance (4) short circuit.
2. the system as claimed in claim 1, is characterized in that, control circuit (5,6,7) is suitable for, if sampling voltage is lower than described threshold value (V
t), automatically forbid the short circuit current on the first resistance (3) or the second resistance (4).
3. the system as described in any one in claim 1 and 2, is characterized in that, control circuit comprises MOS transistor (7), and its drain electrode and source electrode are connected respectively to will be by the terminal of the resistance of short circuit, and its grid-source voltage is corresponding to described threshold value (V
t).
4. as system in any one of the preceding claims wherein, it is characterized in that, control circuit also comprises overload protection device (8,9).
5. as the system of claim 3 and 4 as described in combining; it is characterized in that; described protection device comprises that protective resistance (8) is associated with the series connection of Zener diode (9); the tandem compound that itself and the first resistance (3) and the second resistance (4) form is connected in parallel, and its public terminal is electrically connected to the grid of MOS transistor (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811201562.7A CN109683012B (en) | 2011-11-30 | 2012-11-30 | System for measuring load current and for diagnosing no-load or overload |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR11/03646 | 2011-11-30 | ||
| FR1103646A FR2983300B1 (en) | 2011-11-30 | 2011-11-30 | SYSTEM FOR MEASURING CHARGE CURRENT AND DIAGNOSIS OF ABSENCE OF LOAD OR OVERLOAD |
| PCT/EP2012/074138 WO2013079686A1 (en) | 2011-11-30 | 2012-11-30 | System for measuring a load current and for diagnosing an absence of load or an overload |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811201562.7A Division CN109683012B (en) | 2011-11-30 | 2012-11-30 | System for measuring load current and for diagnosing no-load or overload |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103959074A true CN103959074A (en) | 2014-07-30 |
Family
ID=47501093
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280058687.3A Pending CN103959074A (en) | 2011-11-30 | 2012-11-30 | System for measuring a load current and for diagnosing an absence of load or an overload |
| CN201811201562.7A Active CN109683012B (en) | 2011-11-30 | 2012-11-30 | System for measuring load current and for diagnosing no-load or overload |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811201562.7A Active CN109683012B (en) | 2011-11-30 | 2012-11-30 | System for measuring load current and for diagnosing no-load or overload |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2786158A1 (en) |
| CN (2) | CN103959074A (en) |
| FR (1) | FR2983300B1 (en) |
| WO (1) | WO2013079686A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109791172A (en) * | 2016-10-14 | 2019-05-21 | 罗伯特·博世有限公司 | The method of short circuit in load for identification |
| CN110174545A (en) * | 2019-04-30 | 2019-08-27 | 上海芯导电子科技有限公司 | A kind of multiplexing current detection circuit |
| CN117368798A (en) * | 2023-12-04 | 2024-01-09 | 浙江国利信安科技有限公司 | Fault detection circuit and related circuitry |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459263A (en) * | 2014-12-05 | 2015-03-25 | 深圳市创荣发电子有限公司 | Pointer ampere meter capable of automatically shifting gears |
| CN105242190B (en) * | 2015-10-19 | 2018-11-27 | 矽力杰半导体技术(杭州)有限公司 | Current detection circuit |
| KR102511224B1 (en) * | 2015-11-05 | 2023-03-17 | 삼성전자주식회사 | Fuel Gauge System for Measuring Amount of Current of Battery and Portable Electronic Device Including the Same |
| DE102016101352A1 (en) * | 2016-01-26 | 2017-07-27 | Bag Electronics Gmbh | Arrangement and method for operating a light bulb |
| GB2614280A (en) * | 2021-12-23 | 2023-07-05 | Synaptec Ltd | Signal conditioning stage |
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|---|---|---|---|---|
| US5563541A (en) * | 1994-05-19 | 1996-10-08 | Sony/Tektronix Corporation | Load current detection circuit |
| CN1188894A (en) * | 1994-10-03 | 1998-07-29 | 杨泰和 | Differential pressure divided-flow detection circuit and appliedd circuit |
| CN1755376A (en) * | 2004-09-30 | 2006-04-05 | 日产自动车株式会社 | Overcurrent detection method and testing circuit |
| US20060192547A1 (en) * | 2005-02-28 | 2006-08-31 | Banaska John G | Automatic ranging current shunt |
| US20060250153A1 (en) * | 2005-05-03 | 2006-11-09 | Roger Colbeck | Current sensing for power MOSFETs |
| GB2428301A (en) * | 2005-07-13 | 2007-01-24 | A D Developments Ltd | Current measurement apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000253570A (en) * | 1999-02-26 | 2000-09-14 | Yazaki Corp | Control system for motor electromotive force in electric vehicles |
| JP2002040059A (en) * | 2000-07-24 | 2002-02-06 | Sony Corp | Current detector and control method thereof |
| DE10351873B4 (en) * | 2003-11-06 | 2012-07-26 | Pilz Gmbh & Co. Kg | Device and method for fail-safe switching off an inductive load |
-
2011
- 2011-11-30 FR FR1103646A patent/FR2983300B1/en active Active
-
2012
- 2012-11-30 CN CN201280058687.3A patent/CN103959074A/en active Pending
- 2012-11-30 WO PCT/EP2012/074138 patent/WO2013079686A1/en unknown
- 2012-11-30 CN CN201811201562.7A patent/CN109683012B/en active Active
- 2012-11-30 EP EP12809639.3A patent/EP2786158A1/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5563541A (en) * | 1994-05-19 | 1996-10-08 | Sony/Tektronix Corporation | Load current detection circuit |
| CN1188894A (en) * | 1994-10-03 | 1998-07-29 | 杨泰和 | Differential pressure divided-flow detection circuit and appliedd circuit |
| CN1755376A (en) * | 2004-09-30 | 2006-04-05 | 日产自动车株式会社 | Overcurrent detection method and testing circuit |
| US20060192547A1 (en) * | 2005-02-28 | 2006-08-31 | Banaska John G | Automatic ranging current shunt |
| JP2006242937A (en) * | 2005-02-28 | 2006-09-14 | Keithley Instruments Inc | Auto range current shunt circuit |
| US20060250153A1 (en) * | 2005-05-03 | 2006-11-09 | Roger Colbeck | Current sensing for power MOSFETs |
| GB2428301A (en) * | 2005-07-13 | 2007-01-24 | A D Developments Ltd | Current measurement apparatus |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109791172A (en) * | 2016-10-14 | 2019-05-21 | 罗伯特·博世有限公司 | The method of short circuit in load for identification |
| CN109791172B (en) * | 2016-10-14 | 2021-07-09 | 罗伯特·博世有限公司 | Method for detecting a short circuit on a load |
| US11815043B2 (en) | 2016-10-14 | 2023-11-14 | Robert Bosch Gmbh | Method for detecting a short circuit across a load |
| CN110174545A (en) * | 2019-04-30 | 2019-08-27 | 上海芯导电子科技有限公司 | A kind of multiplexing current detection circuit |
| CN117368798A (en) * | 2023-12-04 | 2024-01-09 | 浙江国利信安科技有限公司 | Fault detection circuit and related circuitry |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2983300A1 (en) | 2013-05-31 |
| WO2013079686A1 (en) | 2013-06-06 |
| CN109683012B (en) | 2022-03-22 |
| CN109683012A (en) | 2019-04-26 |
| FR2983300B1 (en) | 2014-01-10 |
| EP2786158A1 (en) | 2014-10-08 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140730 |
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| RJ01 | Rejection of invention patent application after publication |